A5014172001- Soil and Unsaturated Flow
- Soil erosion and sediment transport
- Soil Carbon and Nitrogen Dynamics
- Soil Geostatistics and Mapping
- Soil and Water Nutrient Dynamics
- Geology and Paleoclimatology Research
- Clay minerals and soil interactions
- Groundwater flow and contamination studies
- Hydrology and Watershed Management Studies
- Soil Management and Crop Yield
- Ecology and Vegetation Dynamics Studies
- Groundwater and Isotope Geochemistry
- Hydrology and Sediment Transport Processes
- Rangeland and Wildlife Management
- Landfill Environmental Impact Studies
- Geochemistry and Geologic Mapping
- Geological formations and processes
- Peatlands and Wetlands Ecology
- Aeolian processes and effects
- Soil Moisture and Remote Sensing
- Soil and Land Suitability Analysis
- Agriculture, Soil, Plant Science
- Wastewater Treatment and Reuse
- Atmospheric and Environmental Gas Dynamics
- Geological and Geochemical Analysis
Agricultural Research Service
1976-2021
University of Arkansas at Fayetteville
2019-2021
University of Nebraska–Lincoln
2016
Natural Resources Conservation Service
2009-2014
Novozymes (Denmark)
2014
University of Florida
2014
University of Georgia
2002-2013
United States Department of Agriculture
1976-2010
National Bureau of Soil Survey and Land Use Planning
2009
Princeton University
2009
Rills often act as sediment sources and the dominant water transport mechanism for hillslopes. Six experiments were conducted on two soils a uniform sand using three experimental methodologies. The results of this study challenge assumption used in hydrologic erosion models that relationships derived sheet flow or larger channel are applicable to actively eroding rills. Velocity did not vary with slope, Reynolds number was consistent predictor hydraulic friction. This result due interactions...
The surface soil organic C (SOC) concentration is a useful property to map soils, interpret properties, and guide fertilizer agricultural chemical applications. objective of this study was determine whether SOC concentrations could be predicted from remotely sensed imagery (an aerial photograph bare soil) 115‐ha field located in Crisp County, Georgia. were determined for samples taken at 28 locations. statistical relationship between image intensity values the red, green, blue bands fit...
Fibronectin type 3 homology domains (Fn3) as found in the cellobiohydrolase CbhA of Clostridium thermocellum are common among bacterial extracellular glycohydrolases. The function these is not clear. modular and composed an N-terminal family IV carbohydrate-binding domain (CBDIV), immunoglobulin-like domain, a 9 glycosyl hydrolase catalytic (Gh9), two Fn3-like (Fn3(1,2)), III (CBDIII), dockerin domain. Efficiency cellulose hydrolysis by truncated forms increased following order: Gh9 (lowest...
ABSTRACT Application of broiler ( Gallus gallus domesticus ) litter to grasslands can increase ammonium (NH 4 –N) and dissolved reactive phosphorus (DRP) concentrations in surface runoff, but it is not known for how long after a application that these remain elevated. This long‐term study was conducted measure NH –N DRP runoff from fertilized with litter. Six 0.75‐ha, fescue Festuca arundinacea Schreb.)–bermudagrass [ Cynodon dactylon (L.) Pers.] paddocks received applications the spring...
Agricultural production must increase significantly to meet the needs of a growing global population with increasing per capita consumption food, fiber, building materials, and fuel. Consumption already exceeds net primary in many parts world (Imhoff et al. 2004).
A number of scientists have named our age the Anthropocene because humanity is globally affecting Earth systems, including soil. Global soil change raises important questions about future soil, environment, and human society. Although many strive to understand forcings as integral genesis, there remains an explicit need for a science anthropedology detail how fully fledged soil-forming factor affects well being. The development maturation critical achieving land-use sustainability needs be...
Abstract In the Piedmont of Southern Appalachian region, soil degradation is most often expressed by crop water deficit that limits yield in warm season. To evaluate nature variability on these cropped lands, soybean [ Glycine max (L.) Merr.] and associated characteristics were measured across range surface conditions 40 farm fields. Factor analysis data permitted identification variables responsible for variability. Carbon was identified as manageable variable could significantly influence...
Soil structure and preferential flow are thought to be highly related, but quantification of this relationship has remained problematic. A combination experiments on two soils at local field scale was used study the relationships between degree structural development, saturated conductivities K s , moisture release, breakthrough parameters, observations scale. The convection dispersion equation mobile‐immobile model were fitted curves, channels stained with dye. Well‐developed associated...
Reestablishing native plant communities is an important focus of ecosystem restoration. In complex landscapes containing a diversity types, restoration requires set reference vegetation conditions for the ecosystems concern, and predictive model to relate community composition physical variables. Restoration also approach prioritizing efforts, facilitate allocation limited institutional resources. Hierarchy theory provides conceptual predicting disturbed and, ultimately, efforts. We...
Abstract In soils formed from limestone, it is often difficult to distinguish between inherited and pedogenic carbonate. nature, both thermodynamic kinetic factors have caused fractionation of C isotopes. While marine carbonates usually δ 13 values near zero, the processes carbonate formation result in considerably lower values, which are dependent only on soil CO 2 gas. Therefore, a simple proportionality may be employed quantitatively estimate soil. Seven pedons over Cretaceous limestone...
:In this study, we used a hierarchical, multifactor ecological classification system to examine how spatial patterns of biodiversity develop in one the most species-rich ecosystems North America, fire-maintained longleaf pine-wiregrass ecosystem and associated depressional wetlands riparian forests. Our goal was determine which landscape features are important controls on species richness, establish these constraints expressed at different levels organization, identify hotspots biological...
Weathering and development of volcanic ash soils show similar patterns in different regions the world; however, specific environmental conditions at a given location result unique combination factors processes governing soil formation. This research was conducted to study pedogenesis on slopes inter‐Andean valley northern Ecuador. Twelve pedons representing pedogenic environments were sampled elevations between 2410 4050 m above sea level (asl). In 3200 asl, allophane Al–humus complexes...
Abstract Shallow surface runoff is a primary transport agent for interrill sediment delivery. Runoff, rainfall intensity, and slope interactively affect erosion. We hypothesized that the inclusion of factor in an erosion model can reduce dependence soil erodibility ( K i ) on infiltration characteristics as well improve predictability. A complete factorial simulation experiment with two soils (Cecil sandy loam, clayey, kaolinitic, thermic Typic Kanhapludult, Dyke clay, mixed, mesic...
Soil pH buffering capacity, since it varies spatially within crop production fields, may be used to define sampling zones assess lime requirement, or for modeling changes in soil when acid‐forming fertilizers manures are added a field. Our objective was develop procedure map this property. One‐hundred‐thirty‐six samples (0‐ 15‐cm depth) from three Georgia Coastal Plain fields were titrated with calcium hydroxide characterize differences capacity of the soils. Since relationship between and...
SUMMARY Findings from multi-year, multi-site field trial experiments measuring maize yield response to inoculation with the phosphorus-solubilizing fungus, Penicillium bilaiae Chalabuda are presented. The main objective was evaluate representative data on crop inoculant across a broad set of different soil, agronomic management and climate conditions. A statistical analysis its variability conducted guide further implementation stratified sampling plan. Field trials, analysed in present...
The most common forestland classification techniques applied in the southeastern United States are vegetation-based. While not completely ignored, application of multifactor, hierarchical ecosystem classifications limited despite their widespread use other regions eastern States. We present one few truly integrated for Coastal Plain. Our approach is iterative, including reconnaissance, plot sampling, and multivariate analysis. Each distinguished by differences physiographic setting,...